KR102542945B1 - Heat exchanger for vehicles - Google Patents

Abstract

The present invention relates to a technology for improving fuel efficiency by realizing an integrated structure of an exhaust heat recovery function and a thermoelectric generation function, and in a cold start mode of a vehicle, exhaust gas flowing into a heat exchange generator is discharged from the exhaust heat recovery means side and the thermoelectric generation means side. By passing through the cooling water, the temperature of the coolant rises rapidly, reducing the engine warm-up time, and generating power through a thermoelectric module, thereby maximizing fuel economy improvement. A vehicle heat exchanger is introduced.

Description

Vehicle heat exchanger {HEAT EXCHANGER FOR VEHICLES}

The present invention relates to a vehicle heat exchanger that improves fuel efficiency by implementing an integrated structure of an exhaust heat recovery function and a thermoelectric power generation function.

In a cold condition at the initial start of the vehicle, the fuel efficiency of the engine is not good compared to a sufficiently warmed-up condition. This is because the friction of the engine is high due to the high viscosity of the oil when the oil temperature is low during cold operation, and the heat loss to the wall surface is large due to the low temperature of the cylinder wall surface, and the combustion stability is deteriorated.

Therefore, in order to improve fuel efficiency and engine durability of a vehicle, it is necessary to quickly raise the temperature of the engine to a normal temperature in the initial stage of starting.

The exhaust heat recovery device recovers exhaust heat through heat exchange between exhaust gas and coolant, and can be used for engine warm-up and heating in the early stage of engine startup, thereby improving fuel efficiency.

However, in the case of the existing exhaust heat recovery device, although it is effective for quick warm-up at the initial start-up in winter, there is a problem in that the effectiveness of the exhaust heat recovery device is reduced because exhaust gas is bypassed without heat exchange in other driving conditions.

Meanwhile, as one of the technologies for improving the fuel efficiency of vehicles, a thermoelectric generator may be used.

A thermoelectric generator is a device using a thermoelectric element that generates electricity by a temperature difference between a high temperature part and a low temperature part, and by using exhaust heat as a high temperature part and cooling water as a low temperature part, it can generate electricity necessary for a vehicle and improve fuel efficiency.

However, in the case of the existing thermoelectric generator, although the utilization period during driving is wider than that of the exhaust heat recovery device, the cost increases due to the thermoelectric element using expensive rare semiconductor elements, and the amount of power generation is limited compared to the cost. There is a problem that the effectiveness of the device is low.

The matters described as the background art above are only for improving understanding of the background of the present invention, and should not be taken as an admission that they correspond to prior art already known to those skilled in the art.

KR 10-2017-0080029 A

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above problems, and an object of the present invention is to provide a vehicle heat exchanger that improves fuel efficiency by implementing a structure in which an exhaust heat recovery function and a thermoelectric generation function are integrated.

The configuration of the present invention for achieving the above object is provided in the exhaust line, the bypass pipe formed with a bypass passage through which the exhaust gas passes; An exhaust heat recovery means for exchanging heat between the exhaust gas and the cooling water is provided by forming an exhaust flow path through which the exhaust gas flowing from the bypass pipe passes and a cooling flow path through which the cooling water passes, and heat of the exhaust gas and the cooling water is converted into a thermoelectric module. Heat exchange generators provided with thermoelectric power generating means to be delivered to each of the heat exchange generators to produce electricity; And controlling the exhaust gas flowing into the bypass pipe to selectively pass along the bypass flow path or the exhaust flow path, and controlling the exhaust gas flowing into the exhaust flow path to separate and pass toward the exhaust heat recovery means or the thermoelectric power generation means. It may be characterized by including; flow path control means.

The exhaust heat recovery unit may include a heat exchange case formed in an enclosure shape and coupled to a bypass pipe; an exhaust passage formed along the longitudinal direction of the heat exchange case through which exhaust gas flows; a cooling passage formed in a shape surrounding the exhaust passage so that the cooling water flows and exchanges heat with the exhaust gas; and a cooling water inlet and a cooling water outlet that are formed in communication with the heat exchange case and through which cooling water is introduced into and discharged from the cooling passage.

The thermoelectric power generation unit may include a heat exchange case formed in a box shape and coupled to a bypass pipe; an exhaust passage formed along the longitudinal direction of the heat exchange case through which exhaust gas flows; a cooling passage formed in a shape surrounding the exhaust passage and through which cooling water flows; a cooling water inlet and a cooling water outlet which are formed in communication with the heat exchange case and through which cooling water is introduced and discharged into the cooling passage; and a thermoelectric module having a sealing structure in the cooling passage, a high-temperature part contacting the outer surface of the exhaust passage to conduct heat, and a low-temperature part contacting the cooling passage to conduct heat.

The sealing structure may include a module cover provided in a shape to cover the thermoelectric module and fastened to an outer surface of the exhaust passage; and a gasket inserted between the module cover and the exhaust passage, provided between the low-temperature portion of the thermoelectric module and the module cover in a state of contact, and providing elastic force to push the high-temperature portion of the thermoelectric module toward the outer surface of the exhaust passage. It may further include a heat transfer spring that allows heat of the cooling water and the exhaust gas to be respectively conducted.

An inlet space and an outlet space communicating with the exhaust passage are formed at both ends of the heat exchange case; A bypass inlet and a bypass outlet are formed at both ends of the bypass pipe; A heat exchanger inlet is formed so that a portion where the inlet space and the bypass pipe are connected communicates with each other; A heat exchanger outlet may be formed such that a portion where the outlet space and the bypass pipe are connected communicates with each other.

The flow path control unit may include a first exhaust flow path provided to allow exhaust gas to pass through the exhaust heat recovery unit; a second exhaust flow path provided to allow exhaust gas to pass through the thermoelectric power generation means; A control valve rotatably coupled to the inside of the bypass pipe about a hinge axis, selectively controlling the opening and closing of the bypass passage and the exhaust passage according to a change in the rotation operating angle of the control valve, and the first exhaust passage and the second exhaust passage can be sequentially opened and closed.

the exhaust heat recovery means is provided along one longitudinal direction inside the heat exchange case; The thermoelectric power generation means is provided along the other longitudinal direction inside the heat exchange case; A partition wall is installed inside the outlet space so that the outlet space is separated into a first outlet space for the exhaust gas passing through the exhaust heat recovery means and a second outlet space for the exhaust gas passing through the thermoelectric power generation means; A first heat exchanger outlet and a second heat exchanger outlet may be formed at portions where the first outlet space and the second outlet space are connected to the bypass pipe, so that the first exhaust passage and the second exhaust passage are separated from each other.

The control valve is coupled with a driving unit to provide rotational force to the hinge shaft; A plate-shaped blocking plate is coupled to the hinge shaft; The hinge shaft is installed along the width direction on the ceiling surface of the bypass pipe, and the bypass passage can be selectively opened and closed while the blocking plate rotates around the hinge shaft.

A first blocking cap and a second blocking cap protrude from the blocking plate in a direction rising toward the first heat exchanger outlet and the second heat exchanger outlet, and have the same rotation path as the first and second blocking caps. It is formed in an arc shape and protrudes; The first heat exchanger outlet and the second heat exchanger outlet are formed at points where the first blocking cap and the second blocking cap rotate upward and meet, so that the blocking cap moves toward the first heat exchanger outlet according to a change in the rotation operating angle of the control valve. and inserted into and blocked from the second heat exchanger outlet; A bypass delay protrusion may be protruded from a bottom surface of the bypass pipe along a rotation path of an end portion of a free end of the blocking plate.

The length of an arc formed by the first blocking cap is longer than the length of an arc formed by the second blocking cap; The free end of the blocking plate is bypassed in the partial rotational operation angle section of the control valve in which the second blocking cap is not inserted into the outlet of the second heat exchanger and only the first blocking cap is inserted into the outlet of the first heat exchanger. It may be configured to close the bypass passage by being close to the delay protrusion.

In the rotational operation angle section of the control valve in which the first blocking cap and the second blocking cap are inserted into the first heat exchanger outlet and the second heat exchanger outlet, respectively, the free end portion of the blocking plate moves upward of the bypass delay projection. It can be configured to be spaced apart to open the bypass flow path.

Through the above problem solving means, the present invention, the exhaust gas flowing into the heat exchange generator in the cold start mode of the vehicle passes through the exhaust heat recovery means side and the thermoelectric power generation means side, so that the temperature of the coolant rises rapidly and the engine warm-up time is shortened In addition, by generating electricity by generating power through the thermoelectric module, there is an effect of maximizing fuel economy improvement.

In addition, in the thermoelectric generation mode, all exhaust gases are controlled to pass intensively only to the thermoelectric generation means side, thereby maximizing the thermoelectric generation efficiency and contributing to fuel efficiency improvement. By passing through the bypass flow path, there is also an effect of preventing the risk of damage due to overheating of the cooling water and the thermoelectric element.

1 is a view showing an operating state in a cold start mode in which exhaust heat recovery and thermoelectric power generation are simultaneously performed by a heat exchanger for a vehicle according to the present invention.
Figure 2 is a view for explaining the operating state of the control valve according to Figure 1 and the flow of exhaust gas accordingly.
3 is a view showing an operating state of a thermoelectric power generation mode maximizing thermoelectric power generation by the vehicle heat exchanger of the present invention.
Figure 4 is a view for explaining the operating state of the control valve according to Figure 3 and the flow of the exhaust gas accordingly.
5 is a view showing an operating state in a bypass mode in which exhaust heat recovery and thermoelectric power generation are not performed by the vehicle heat exchanger according to the present invention.
6 is a view for explaining the operating state of the control valve according to FIG. 5 and the flow of exhaust gas accordingly;
7 is a view showing the configuration of an exhaust flow path and a cooling flow path in the vehicle heat exchanger of the present invention.
8 is a view for explaining a structure in which a thermoelectric module is mounted in an exhaust passage according to the present invention;
9 is a view for conceptually explaining a state in which an exhaust heat recovery means and a thermoelectric power generation means are separated according to the present invention.

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The heat exchange device for a vehicle according to the present invention largely includes a bypass pipe 100, a heat exchange generator 200, and flow control means.

Referring to FIGS. 1 and 2, looking at the present invention in detail, first, the bypass pipe 100 has a hollow interior and both ends are connected to the middle of the exhaust line, and the bypass pipe 100 allows exhaust gas to pass therein. A flow path 110 may be formed.

The heat exchange generator 200 is provided with an exhaust heat recovery means and a thermoelectric power generation means, respectively. The exhaust heat recovery means has an exhaust passage 220 formed so that the exhaust gas flowing from the bypass pipe 100 passes therethrough. A cooling passage 230 through which the cooling water passes is formed so that the exhaust gas and the cooling water exchange heat to recover exhaust heat.

And, the thermoelectric generator is configured to generate electricity by transferring the heat of the exhaust gas and the cooling water to the thermoelectric module 240, respectively. At this time, the electricity generated through the thermoelectric power generation unit may be charged in a battery or provided to electrical equipment for use.

In addition, the passage control means controls the exhaust gas flowing into the bypass pipe 100 to selectively pass along the bypass passage 110 or the exhaust passage 220, and flows into the exhaust passage 220 together. It is possible to control the exhaust gas separated and passed toward the exhaust heat recovery means or the thermoelectric power generating means.

That is, by adjusting and operating the control valve 300 according to the driving conditions of the vehicle, the exhaust gas flowing into the bypass pipe 100 passes through the bypass passage 110 inside the bypass pipe 100 as it is. Alternatively, it may pass through the exhaust passage 220 in the heat exchange generator 200.

Therefore, the engine warm-up time can be shortened by rapidly increasing the temperature of the cooling water through the recovery of exhaust heat from heat exchange between the exhaust gas and the cooling water, and at the same time, electricity is generated through the thermoelectric module 240 to produce electricity, thereby improving fuel efficiency. be able to do

In particular, in the case of an operating condition in which exhaust gas flows into the exhaust passage 220, since the exhaust gas can be separated and passed to the exhaust heat recovery means side and the thermoelectric generation means side, the above-described cold start that simultaneously performs engine warm-up and thermoelectric power generation mode, as well as a thermoelectric power generation mode that maximizes thermoelectric power generation, contributing to fuel efficiency improvement.

On the other hand, referring to FIGS. 7 and 9, examining the configuration of the exhaust heat recovery means provided in the heat exchange generator 200 in more detail, the exhaust heat recovery means is bypassed by the heat exchange case 210 formed in the shape of an enclosure. It is coupled to the upper surface of the pipe 100, and a plurality of exhaust passages 220 are formed along the longitudinal direction of the heat exchange case 210, that is, the direction in which the exhaust gas flows within the heat exchange case 210, Exhaust gas may flow along 220. At this time, the exhaust passage 220 may be formed in a certain section in the middle of the heat exchange case 210 .

In addition, it is formed in a shape surrounding the exhaust passage 220 among the sections of the heat exchange case 210 in which the exhaust passage 220 is formed, and the cooling water flows along the cooling passage 230 while the exhaust gas in the exhaust passage 220 is formed. can exchange heat with

For example, the cooling passage 230 is configured by filling cooling water in the remaining space excluding the exhaust passage 220 within a certain section of the heat exchange case 210 in which the exhaust passage 220 is formed, and the cooling passage 230 ) is configured to maintain airtightness with the space through which the exhaust gas passes, including the exhaust passage 220 in the heat exchange case 210.

In addition, a cooling water inlet 231 and a cooling water outlet 233 are formed in communication with one surface and the other surface of the heat exchange case 210 so that the cooling water can be introduced into and discharged from the cooling passage 230 .

That is, the exhaust gas flows along the exhaust passage 220 provided in the heat exchange case 210, and the coolant flows along the cooling passage 230 provided in a shape surrounding the exhaust passage 220, so that the vehicle is running. Exhaust heat is recovered through heat exchange between the exhaust gas and the cooling water, thereby rapidly increasing the temperature of the cooling water, thereby shortening the engine warm-up time.

In addition, referring to FIGS. 7 to 9 , looking at the configuration of the thermoelectric power generation unit provided in the heat exchange generator 200 in more detail, the thermoelectric power generation unit has a heat exchange case 210 formed in an enclosure shape to bypass the It is coupled to the upper surface of the pipe 100, and a plurality of exhaust passages 220 are formed along the longitudinal direction of the heat exchange case 210, that is, the direction in which the exhaust gas flows within the heat exchange case 210, Exhaust gas may flow along 220. At this time, the exhaust passage 220 may be formed in a certain section in the middle of the heat exchange case 210 .

In addition, it is formed in a shape surrounding the exhaust passage 220 among the sections of the heat exchange case 210 in which the exhaust passage 220 is formed, and the cooling water flows along the cooling passage 230 while the exhaust gas in the exhaust passage 220 is formed. can exchange heat with

For example, the cooling passage 230 is configured by filling cooling water in the remaining space excluding the exhaust passage 220 within a certain section of the heat exchange case 210 in which the exhaust passage 220 is formed, and the cooling passage 230 ) is configured to maintain airtightness with the space through which the exhaust gas passes, including the exhaust passage 220 in the heat exchange case 210.

In addition, a cooling water inlet 231 and a cooling water outlet 233 are formed in communication with one surface and the other surface of the heat exchange case 210 so that the cooling water can be introduced into and discharged from the cooling passage 230 .

In addition, a thermoelectric module 240 is provided as a sealing structure in the cooling passage 230 . At this time, the high-temperature part 243 of the thermoelectric module 240 may contact the outer surface of the exhaust passage 220 to conduct heat, and the low-temperature part 241 may contact the cooling passage 230 to conduct heat. there is.

That is, the exhaust gas flowing through the exhaust passage 220 contacts the metal of the high-temperature part 243 and the coolant flowing through the cooling passage 230 contacts the metal of the low-temperature part 241 and conducts heat. Electricity can be generated and generated by the temperature difference of the high-temperature part 243, and thus fuel efficiency of the vehicle can be improved.

In addition, referring to FIGS. 1 and 8, looking at the sealing structure for sealing and coupling the thermoelectric module 240 in the cooling passage 230, a module cover 245 is provided in a shape to cover the thermoelectric module 240. The module cover 245 is fastened to the outer surface of the exhaust passage 220 in a coupling structure such as a bolting method.

A gasket 247 may be inserted between the module cover 245 and the exhaust passage 220 to seal the thermoelectric module 240 inside the module cover 245 . At this time, a wire passes through the module cover 245 and is connected to the thermoelectric module 240, and the wiring is also coupled to the module cover 245 in a waterproof structure.

However, due to the sealing structure using the module cover 245, the heat of the cooling water and the exhaust gas may not be smoothly transferred to the low temperature part 241 and the high temperature part 243 of the thermoelectric module 240.

Therefore, in the present invention, the heat transfer spring 249 is provided between the low temperature part 241 of the thermoelectric module 240 and the module cover 245 in a contact state so that the high temperature part 243 of the thermoelectric module 240 is used as an exhaust flow path. Since an elastic force pushing toward the outer surface of the 220 is provided, the heat of the cooling water and the exhaust gas may be conducted to the low-temperature portion 241 and the high-temperature portion 243, respectively.

Meanwhile, as shown in FIGS. 1 and 2, according to the present invention, the exhaust gas flowing into the bypass pipe 100 passes through the exhaust passage 220 in the heat exchange case 210 and returns to the bypass pipe 100. It is made up of a structure that flows into

To this end, in the present invention, an inlet space 250 and an outlet space 260 communicating with the exhaust passage 220 inside the bypass pipe 100 are formed at both ends of the heat exchange case 210, respectively.

In addition, the bypass inlet 120 and the bypass outlet 130 are formed at both ends of the bypass pipe 100, and heat exchange is performed so that the inlet space 250 and the bypass pipe 100 communicate with each other. An entry port 280 is formed, and a heat exchanger outlet 290 is formed so that a portion where the outlet space 260 and the bypass pipe 100 are connected communicates with each other.

That is, the exhaust gas flowing into the bypass pipe 100 through the bypass inlet 120 flows into the inlet space 250 through the heat exchanger inlet 280, and the exhaust gas introduced into the inlet space 250 The gas flows along the exhaust passage 220 and is discharged to the outlet space 260, and the exhaust gas discharged to the outlet space 260 flows back into the bypass pipe 100 through the heat exchanger outlet 290. It is discharged through the bypass outlet 130.

On the other hand, the flow path control means of the present invention is for changing and controlling the flow direction of exhaust gas. Looking at the configuration of the flow path control means in detail, first, the exhaust flow path 220 includes the first exhaust flow path 220a and the second exhaust flow path 220a. It can be divided into an exhaust flow path 220b, wherein the first exhaust flow path 220a is a flow path provided to allow exhaust gas to pass through the exhaust heat recovery means, and the second exhaust flow path 220b allows exhaust gas to pass through the thermoelectric power generation unit. It may be a flow path provided to pass through the means.

Referring to FIGS. 7 and 9 , looking at a structure for separating the first exhaust flow path 220a and the second exhaust flow path 220b as an example, the exhaust heat recovery means is located in one longitudinal direction inside the heat exchange case 210. It is provided along, and the thermoelectric power generating means is provided along the other longitudinal direction inside the heat exchange case 210.

That is, the space inside the heat exchanger case is divided into two sides based on the flow direction of the exhaust gas, and an exhaust heat recovery means is provided on one side and a thermoelectric power generation means is provided on the other side.

In addition, a partition wall 270 is installed at the center of the exit space 260 to divide the exit space 260, so that the first exit space 260a and the second exit space 260b are left and right of the partition wall 270. ) is formed. That is, the exhaust gas passing through the exhaust heat recovery means is separated into a first outlet space 260a and the exhaust gas passing through the thermoelectric generating means is separated into a second outlet space 260b.

In addition, a first heat exchanger outlet 290a is formed at a portion where the first outlet space 260a and the bypass pipe 100 are connected, and the second outlet space 260b and the bypass pipe 100 are connected. By forming the second heat exchanger outlet 290b at the portion, the exhaust gas can be formed by being separated into the first exhaust passage 220a passing through the exhaust heat recovery means and the second exhaust passage 220b passing through the thermoelectric generating means. there is.

In addition, the control valve 300 is coupled to the inside of the bypass pipe 100 so as to be rotatable around the hinge shaft 310, and the bypass passage 110 ) and the exhaust passage 220 can be selectively opened and closed, and in addition, the first exhaust passage 220a and the second exhaust passage 220b can be sequentially opened and closed.

Referring to FIGS. 1 and 2, the configuration of the control valve 300 will be described in more detail. A drive unit 310a is coupled to provide rotational force to the hinge shaft 310, and The blocking plate 320 of is coupled.

In addition, the hinge shaft 310 is installed along the width direction on the ceiling surface of the bypass pipe 100, and the blocking plate 320 rotates around the hinge shaft 310, thereby moving the bypass passage 110 It is configured to selectively open and close.

Here, the driving unit 310a can be configured in various embodiments according to a structure providing operating force, and preferably can rotate the hinge shaft 310 with driving force of an electric motor. When an electric motor is applied as described above, when an output value reflecting the driving state of the vehicle is input to the controller, the controller controls the operation of the electric motor based on the output value, and thus the exhaust gas flow direction according to the driving conditions of the vehicle. can be properly controlled.

As another example of the drive unit, it may be configured to provide rotational force to the hinge shaft 310 using the principle that wax expands/contracts according to the temperature of the cooling water. ) can also be configured to provide rotational force.

That is, as shown in FIGS. 5 and 6, when the blocking plate 320 is separated from the bottom surface of the bypass pipe 100 by rotating the control valve 300, the bypass passage 110 in the bypass pipe 100 ) is opened, the exhaust gas does not flow into the exhaust passage 220 and passes through the bypass passage 110 in the bypass pipe 100 as it is, thereby preventing the cooling water and the thermoelectric element from being damaged due to overheating.

Of course, as shown in FIGS. 1 and 2, when the blocking plate 320 comes into close contact with the bottom surface of the bypass pipe 100 by the rotational operation of the control valve 300, the bypass flow path in the bypass pipe 100 ( 110) is blocked, the exhaust gas does not flow into the bypass flow path 110 and passes through the exhaust flow path 220, so that the exhaust heat recovery function and the thermoelectric power generation function can be performed.

In addition, in the present invention, the first blocking cap 330a and the second blocking cap 330b extend from the blocking plate 320 toward the first heat exchanger outlet 290a and the second heat exchanger outlet 290b. ) are each protruded, and the first blocking cap 330a and the second blocking cap 330b protrude in the same arc shape as the rotational path of each blocking cap.

In addition, the first heat exchanger outlet 290a and the second heat exchanger outlet 290b are formed at points where the first blocking cap 330a and the second blocking cap 330b rotate upward and meet, so that the control valve As the rotation angle of 300 changes, the blocking cap is inserted into the first heat exchanger outlet 290a and the second heat exchanger outlet 290b to block them.

At this time, the first blocking cap 330a and the second blocking cap 330b are formed in a shape corresponding to the first heat exchanger outlet 290a and the second heat exchanger outlet 290b, so that the first blocking cap The first heat exchanger outlet 290a and the second heat exchanger outlet 290b can be blocked by the 330a and the second blocking cap 330b.

In addition, a bypass delay protrusion 140 may protrude from the bottom surface of the bypass pipe 100 along a rotational path of an end portion of the free end 320a of the blocking plate 320 .

That is, in the process of upward rotation of the first blocking cap 330a and the second blocking cap 330b according to the rotational operation of the control valve 300, the first blocking cap 330a moves through the first heat exchanger outlet ( 290a), the first heat exchanger outlet 290a is blocked and exhaust gas does not pass through the first exhaust passage 220a, and similarly, the second blocking cap 330b closes the second heat exchanger outlet 290b. ), the second heat exchanger outlet 290b is blocked and exhaust gas does not pass through the second exhaust passage 220b.

In addition, in spite of the rotational operation of the control valve 300, when the end of the blocking plate 320 is closely positioned on the bypass delay protrusion 140, the blocking plate 320 still moves through the bypass passage 110. By maintaining the blocking state, the exhaust gas is configured to pass through the exhaust passage 220 in the heat exchange generator 200 without passing through the bypass passage 110 .

According to this configuration, in the present invention, in a state in which the bypass flow path 110 and the first exhaust flow path 220a are blocked, as shown in FIGS. It can be configured to realize a thermoelectric power generation mode that maximizes the thermoelectric power generation function by opening only the flow path 220b.

To this end, in the present invention, the length of the arc formed by the first blocking cap 330a is longer than the length of the arc formed by the second blocking cap 330b.

Also, a part of the control valve 300 in which the second blocking cap 330b is not inserted into the second heat exchanger outlet 290b and only the first blocking cap 330a is inserted into the first heat exchanger outlet 290a. In the rotation operation angle section, the free end 320a of the blocking plate 320 may be configured to close the bypass passage 110 by being in close contact with the bypass delay projection 140 .

That is, when the blocking plate 320 is rotated at a predetermined angle by the rotational operation of the control valve 300, the tip of the blocking plate 320 is closely positioned on the bypass delay protrusion 140 to flow through the bypass passage. 110 is maintained, and the first heat exchanger outlet 290a is blocked while the first blocking cap 330a is inserted into the first heat exchanger outlet 290a, thereby blocking the first exhaust passage 220a. ) is blocked. However, the second blocking cap 330b is not inserted into the second heat exchanger outlet 290b and the second heat exchanger outlet 290b is opened, so that only the second exhaust passage 220b is opened, and thus the bypass pipe ( Exhaust gas flowing into 100) is intensively passed through the second exhaust passage 220b.

Therefore, since all the exhaust gas is passed only to the thermoelectric power generation means side, the thermoelectric power generation efficiency can be maximized, thereby greatly contributing to improving fuel efficiency.

In addition, in the present invention, in an accelerated driving situation in which the cooling water and the exhaust gas are overheated, as shown in FIGS. ) can be configured to enable the implementation of a bypass mode that opens only.

To this end, the present invention relates to the control valve 300 in which the first blocking cap 330a and the second blocking cap 330b are inserted into the first heat exchanger outlet 290a and the second heat exchanger outlet 290b, respectively. In the rotational operation angle section, the free end 320a of the blocking plate 320 may be spaced apart from the bypass delay protrusion 140 upward to open the bypass passage 110 .

That is, when the blocking plate 320 is fully opened by the rotational operation of the control valve 300, the end of the blocking plate 320 is spaced upward from the bypass delay protrusion 140 so that the bypass passage 110 ) is opened. However, the first blocking cap 330a is inserted into the first heat exchanger outlet 290a and the second blocking cap 330b is inserted into the second heat exchanger outlet 290b so that all heat exchanger outlets 290 are blocked. As a result, the first exhaust passage 220a and the second exhaust passage 220b are blocked.

Therefore, since all the exhaust gas passes through the bypass passage 110 in the bypass pipe 100, the risk of damage due to overheating of the cooling water and the thermoelectric element can be prevented.

In the present invention, as shown in FIGS. 1 and 2, the exhaust heat recovery function and the thermoelectric power generation function are performed by opening the first exhaust flow path 220a and the second exhaust flow path 220b in a state in which the bypass flow path 110 is blocked. It can be configured to implement a cold start mode that is performed simultaneously.

That is, when the control valve 300 is not rotated and the blocking plate 320 is in a completely closed state, the end of the free end 320a of the blocking plate 320 is on the bottom surface of the bypass pipe 100. Closely closed, the bypass flow path 110 is maintained. However, since the first blocking cap 330a is not inserted into the first heat exchanger outlet 290a and the second blocking cap 330b is not inserted into the second heat exchanger outlet 290b, the first heat exchanger outlet 290a ) and the second heat exchanger outlet 290b are both opened, the first exhaust flow path 220a and the second exhaust flow path 220b are opened, and thus the exhaust gas flowing into the bypass pipe 100 is discharged from the first exhaust flow path. It passes through the flow path 220a and the second exhaust flow path 220b.

Therefore, as the exhaust gas flowing into the heat exchange generator 200 passes through the exhaust heat recovery means side and the thermoelectric generation means side, the temperature of the coolant rises rapidly, thereby shortening the engine warm-up time and power generation through the thermoelectric module 240 By generating electricity, it is possible to maximize fuel efficiency improvement.

On the other hand, although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical idea of the present invention, and it is natural that these changes and modifications fall within the scope of the appended claims. .

100: bypass pipe 110: bypass flow
120: bypass entrance 130: bypass exit
140: bypass delay protrusion 200: heat exchange generator
210: heat exchange case 220: exhaust passage
220a: first exhaust flow path 220b: second exhaust flow path
230: cooling passage 231: cooling water inlet
233: cooling water outlet 240: thermoelectric module
241: low temperature part 243: high temperature part
245: module cover 247: gasket
249: heat transfer spring 250: entrance space
260: exit space 260a: first exit space
260b: second exit space 270: bulkhead
280: heat exchanger inlet 290: heat exchanger outlet
290a: first heat exchanger outlet 290b: second heat exchanger outlet
300: control valve 310: hinge axis
320: blocking plate 320a: free end
330a: first blocking cap 330b: second blocking cap

Claims (11)

A bypass pipe provided in the exhaust line and formed with a bypass passage through which exhaust gas passes;
An exhaust heat recovery means for exchanging heat between the exhaust gas and the cooling water is provided by forming an exhaust flow path through which the exhaust gas flowing from the bypass pipe passes and a cooling flow path through which the cooling water passes, and heat of the exhaust gas and the cooling water is converted into a thermoelectric module. Heat exchange generators provided with thermoelectric power generating means to be delivered to each of the heat exchange generators to produce electricity; and
Controlling the exhaust gas flowing into the bypass pipe to selectively pass along the bypass flow path or the exhaust flow path, and controlling the exhaust gas flowing into the exhaust flow path to separate and pass through the exhaust heat recovery means or the thermoelectric power generation means. Including; control means;
The thermoelectric module is provided in the cooling passage in a sealing structure, and the high temperature part conducts heat with the exhaust gas of the exhaust passage and the low temperature part conducts heat with the cooling water in the cooling passage.
The sealing structure,
a module cover provided in a shape to cover the thermoelectric module and fastened to an outer surface of the exhaust passage;
Including; a gasket inserted between the module cover and the exhaust flow path,
a heat transfer spring provided between the low-temperature portion of the thermoelectric module and the module cover in a state of contact, and providing elastic force to push the high-temperature portion of the thermoelectric module toward the outer surface of the exhaust passage so that the heat of the cooling water and the exhaust gas are respectively conducted; Vehicle heat exchanger, characterized in that it comprises. The method of claim 1,
The exhaust heat recovery means,
A heat exchange case formed in the shape of an enclosure and coupled to the bypass pipe;
an exhaust passage formed along the longitudinal direction of the heat exchange case through which exhaust gas flows;
a cooling passage formed in a shape surrounding the exhaust passage so that the cooling water flows and exchanges heat with the exhaust gas; and
and a cooling water inlet and a cooling water outlet formed in communication with the heat exchange case and through which cooling water is introduced and discharged into the cooling passage. The method of claim 1,
The thermoelectric power generation means,
A heat exchange case formed in the shape of an enclosure and coupled to the bypass pipe;
an exhaust passage formed along the longitudinal direction of the heat exchange case through which exhaust gas flows;
a cooling passage formed in a shape surrounding the exhaust passage and through which cooling water flows;
a cooling water inlet and a cooling water outlet which are formed in communication with the heat exchange case and through which cooling water is introduced and discharged into the cooling passage; and
and a thermoelectric module provided in the cooling passage as a sealing structure, a high-temperature part contacting an outer surface of the exhaust passage to conduct heat, and a low-temperature part contacting the cooling passage to conduct heat. . delete According to claim 2 or claim 3,
An inlet space and an outlet space communicating with the exhaust passage are formed at both ends of the heat exchange case;
A bypass inlet and a bypass outlet are formed at both ends of the bypass pipe;
A heat exchanger inlet is formed so that a portion where the inlet space and the bypass pipe are connected communicates with each other;
A heat exchange device for a vehicle, characterized in that a heat exchanger outlet is formed so that the outlet space and a portion where the bypass pipe is connected communicate with each other. The method of claim 5,
The flow control means,
a first exhaust passage provided to allow exhaust gas to pass through the exhaust heat recovery means;
a second exhaust flow path provided to allow exhaust gas to pass through the thermoelectric power generation means;
A control valve rotatably coupled to the inside of the bypass pipe around a hinge axis;
The heat exchanger for a vehicle, characterized in that the bypass flow path and the exhaust flow path are selectively opened and closed according to the change in the rotation operating angle of the control valve, and the first exhaust flow path and the second exhaust flow path are sequentially opened and controlled. The method of claim 6,
the exhaust heat recovery means is provided along one longitudinal direction inside the heat exchange case;
The thermoelectric power generation means is provided along the other longitudinal direction inside the heat exchange case;
A partition wall is installed inside the outlet space so that the outlet space is separated into a first outlet space for the exhaust gas passing through the exhaust heat recovery means and a second outlet space for the exhaust gas passing through the thermoelectric power generation means;
A first heat exchanger outlet and a second heat exchanger outlet are formed at the portion where the first outlet space and the second outlet space and the bypass pipe are connected, respectively, so that the first exhaust flow path and the second exhaust flow path are formed separately. vehicle heat exchanger. The method of claim 7,
The control valve is
A driving unit is coupled to provide rotational force to the hinge shaft;
A plate-shaped blocking plate is coupled to the hinge shaft;
The vehicle heat exchanger according to claim 1 , wherein the hinge shaft is installed along the width direction on the ceiling surface of the bypass pipe, and the blocking plate selectively opens and closes the bypass passage while rotating around the hinge shaft. The method of claim 8,
A first blocking cap and a second blocking cap protrude from the blocking plate in a direction rising toward the first heat exchanger outlet and the second heat exchanger outlet, and have the same rotation path as the first and second blocking caps. It is formed in an arc shape and protrudes;
The first heat exchanger outlet and the second heat exchanger outlet are formed at points where the first blocking cap and the second blocking cap rotate upward and meet, so that the blocking cap moves toward the first heat exchanger outlet according to a change in the rotation operating angle of the control valve. and inserted into and blocked from the second heat exchanger outlet;
A heat exchanger for a vehicle, characterized in that a bypass retardation protrusion is formed on a bottom surface of the bypass pipe along a rotation path of an end portion of a free end of the blocking plate. The method of claim 9,
The length of an arc formed by the first blocking cap is longer than the length of an arc formed by the second blocking cap;
The free end of the blocking plate is bypassed in the partial rotational operation angle section of the control valve in which the second blocking cap is not inserted into the outlet of the second heat exchanger and only the first blocking cap is inserted into the outlet of the first heat exchanger. A heat exchanger for a vehicle, characterized in that configured to close the bypass flow path by being close to the delay protrusion. The method of claim 9,
In the rotational operation angle section of the control valve in which the first blocking cap and the second blocking cap are inserted into the first heat exchanger outlet and the second heat exchanger outlet, respectively, the free end portion of the blocking plate moves upward of the bypass delay projection. A heat exchanger for a vehicle, characterized in that configured to be spaced apart to open the bypass flow path.

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